U.S. patent number 3,765,496 [Application Number 05/211,864] was granted by the patent office on 1973-10-16 for drill head unit with throwaway insert holders.
Invention is credited to Margarita C. Flores, Arnol Staggs.
United States Patent |
3,765,496 |
Flores , et al. |
October 16, 1973 |
**Please see images for:
( Certificate of Correction ) ** |
DRILL HEAD UNIT WITH THROWAWAY INSERT HOLDERS
Abstract
A drilling tool for use in the mining industries, the present
tool having advantages over presently existing drill heads in view
that it costs less, provides more cutting edges and promotes safety
to miners, the device consisting of a main member having a shank
for being attached to a drilling machine or some other device, the
main member at its opposite end having a working head that includes
securement there to of a pair of throw away insert holders, each
one of the holders having a hexagonal shaped carbide throw insert
secured there to by means of a screw.
Inventors: |
Flores; Margarita C.
(Wyandotte, MI), Staggs; Arnol (Wyandotte, MI) |
Family
ID: |
22788608 |
Appl.
No.: |
05/211,864 |
Filed: |
December 27, 1971 |
Current U.S.
Class: |
175/383; 175/413;
175/420.1 |
Current CPC
Class: |
E21B
10/633 (20130101) |
Current International
Class: |
E21B
10/00 (20060101); E21B 10/62 (20060101); E21b
009/06 () |
Field of
Search: |
;175/383,410,413 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Purser; Ernest R.
Claims
What I now claim is:
1. A drill head unit comprising in combination:
a. a main member,
b. a shank integrally formed with the main member at one end
thereof,
c. a working head disposed on the other end of the main member, the
head having at least a pair of openings formed therethrough,
d. at least a pair of holders, the holders being insertable into
the openings, and
e. at least a pair of inserts each being supportable by one of the
holders, and
wherein the shank has an aperture formed therein and extending
through the holders.
2. A combination as set forth in claim 1 wherein the openings have
a 5.degree. angular pitch respective to a longitudinal axis of said
main body member, said angularly inclined openings each supporting
one of said holders.
3. The combination as set forth in claim 2, wherein said holder
includes a longitudinal shank receivable within said angularly
inclined opening of said member, and which further includes means
for securing the shank in the opening, an opposite end of said
holder having a seat formed thereupon into which said insert is
placeable, said seat including a flat face and a V-shaped edge to
form a corner into which one corner of the insert is
receivable.
4. The combination as set forth in claim 3 including means for
securing the insert to the holder and wherein said insert comprises
a flat member having six hexagonal side cutting edges.
5. The combination as set forth in claim 3 wherein said insert
comprises a flat member having six hexagonal side cutting edges,
said insert being securable to said holder by means of a single
screw.
6. In an improved drill head unit, the combination of a main member
supporting a pair of holders, an extending square shank formed
integrally with the main body member at one end thereof, the shank
having at one end a threaded aperture extending through the holder,
the opposite end of said main member forming a working head, said
working head being provided with a pair of openings at a 5.degree.
angular pitch respective to a longitudinal axis of said main body
member, said angularly inclined openings each supporting one of
said holders, and each of said holders supporting a hexagonal
carbide throw away insert.
7. The combination as set forth in claim 6 wherein said holder
includes a longitudinal shank receivable within said angularly
inclined openings of said main member and is securable therein by
means of a set screw positioned against a notch in said holder
shank, an opposite end of said holder having a seat formed
thereupon into which said insert is placable, said seat including a
flat face and V-shaped edge to form a corner into which one corner
of said hexagonal insert is receivable.
Description
This invention relates generally to mining industry tools. More
specifically it relates to drill heads.
A principal object of the present invention is to provide a drill
head unit having important advantages over conventional drill heads
used in the mining industry, one of the advantages comprising a
saving of approximately 50%. At the present time a good drill head
used in a mining operation may cost approximately six or eight
dollars, whereas the present invention can be sold at not more than
four dollars in comparison.
Another purpose of the present invention is to provide a drill head
unit having the advantage over existing drill heads by including
from three to six cutting edges.
Still another object of the present invention is to provide a drill
head unit wherein the cutting edges can be quickly and easily
repositioned by turning a single screw.
Still another purpose of the present invention is to provide a
drill head unit which accordingly is superior to a presently
existing drill head and which has been proven in actual use in the
field and which has been phrased by mining operator's as being
superior.
In the present mining industry, a drill head is made of a single
solid piece, the drill head having two prongs with carbide brazed
upon them, and when in use, the carbide wears or breaks so that the
tool must necessarily be resharpened and the process repeated until
the carbide is used up or thrown away. Then the entire tool is
thrown away. In the present invention, a main member and a pair of
supporting holders are retained and only individual carbide throw
away inserts are discarded after three to six sides thereof have
been utilized.
Still another purpose is to provide a drill head unit which serves
a dual purpose; the main member being used in clockwise or
counter-clockwise manner. The insert holders are changable from one
side to another, and they are interchangeable from one size tool
holder to a larger or smaller size tool holder.
Other objects of the present invention are to provide a drill head
tool holder which is simple in design, inexpensive to manufacture,
rugged in construction, easy to use and efficient in operation.
These and other objects will be readily evident upon a study of the
following specification and the accompanying drawings wherein:
FIG. 1 is a side elevation view of the present invention shown
assembled.
FIG. 2 is a perspective view of the main member.
FIG. 3 is a bottom perspective view thereof.
FIG. 4 is a side elevation view of the insert holder.
FIG. 5 is a top view of the main member.
FIG. 6 is a cross sectional view of the device taken on line 6--6
of FIG. 8.
FIG. 7 is a detail view of the interfit of the parts.
FIG. 8 is a front elevation view of the invention shown
assembled.
Referring now to the drawings in detail, the reference numeral 10
represents a drill head unit holder according to the present
invention wherein there is a main member 11 which at one end
thereof is integral with a longitudinally extending square shank 12
which is 1/2 inch in square dimension. A transverse extending
threaded hole 13 extends near the terminal end of the shank 12 and
another opening 14 extends longitudinally through the shank and the
entire main member and is used for liquid coolent flowing to the
cutting head and the cutting edges to be described herein
after.
A working head 15 on an opposite end of the main member includes a
pair of three eighth of an inch diameter openings 16 which extend
at a 5.degree. angular pitch respective to a longitudinal axis of
the main member 11.
Within each of the openings 16 there is insertable a shank 17 of a
throw away insert holder 18, the shank 17 having a notch 19 for
receiving a set screw 20 threadingly engaged on opposite sides of
the working head 15.
Each of the two throw away insert holders supports a hexagonal
carbide throw away insert 21 secured there to by means of a screw
22 threadingly engageable within a threaded opening 23 in the
holder 18. As shown in FIG. 7, it is to be noted that the holder 18
includes a flat side 24 against which the throw away insert 21 is
positioned and the holder includes a V-shaped notch 25 of 120
degrees angle and into which one corner 26 of the throw away insert
21 is placeable. Thus the insert 21 is in a fixed and secured
position so it cannot move. For this reason it is to be noted that
the side edges of the insert 21 are angularly inclined and the
angular side of the holder notch 25 is correspondingly inclined so
that as shown in FIG. 6, the inclined edges abutt with each
other.
As best shown in FIG. 8, it is to be noted that the inserts are
located facing in opposite directions so that during rotation of
the main member, the inserts are located 180.degree. apart during
rotation of the tool.
The throw away insert 21 is three quarters of an inch wide, three
sixteenths of an inch in thickness and has a three sixteenth of an
inch diameter central opening 27 so to receive screw 22.
It is to be noted that the one sixteenth of an inch diameter
opening 14 extending longitudinally through the main member 11
serves to bring coolent liquid to the cutting edges so that the
cutting edges of the insert do not get hot but remain cool. It is
well known that if a hot drill head used in mining operation hits a
gas pocket in the ground while drilling, there may be an explosion.
With the coolent thus being supplied through opening 14, the cutter
edges remain cool so to prevent a dangerous explosion, thereby
promoting mining safety.
Thus there is provided a drill head tool holder with inserts that
is superior to existing drill heads used in the mining industry.
The present invention consists of only the three parts plus the
inserts each one of which has six cutting edges so that it can be
used for an extended life and after it is used up then only the
insert is thrown away and not the entire tool such as is presently
being done by conventional drill heads.
The insert holders with inserts are designed to cut clockwise or
counter-clockwise. For instance, if a person has two tool holders
in operation, one turning in a clockwise direction, and the other
turning in a counter-clockwise direction, the inserts can be used
in one holder; and if needed immediately, they can be taken out of
the one and interchanged with the other. This feature is
particularly important in view that at the present time in drilling
operations conducted in the mines, two different size holes are
drilled. To drill these two holes, the mine operator must use three
different size drill heads; one size for the coal and two different
sizes for the roof.
The advantage of the present tool is this: It uses two different
size holders, one for the coal and one for the roof. The insert
holder with inserts serves a dual purpose. It uses two inserts in
the holder for the coal. Then interchange the same to insert
holders with the tool holder in the roof. The difference in this:
By using the present holders and insert holders with inserts, two
drill heads are eliminated.
Thus the main member being the tool holder, can be used in
different sizes, the insert holders with inserts being changeable
and interchangeable serving a dual purpose.
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